Cannot be Normal Summoned/Set. Must be Special Summoned with the effect of a "Drytron" card. You can Tribute 1 other "Drytron" monster, or 1 Ritual Monster, from your hand or field; Special Summon this card from your hand or GY in Defense Position, then you can add 1 Ritual Monster from your Deck to your hand. You cannot Special Summon monsters, except monsters that cannot be Normal Summoned/Set, the turn you activate this effect. You can only use this effect of "Drytron Alpha Thuban" once per turn.
![Drytron Alpha Thuban [GEIM-EN024] Super Rare | The CG Realm](http://www.thecgrealm.com/cdn/shop/products/848ce76b-a2a9-509d-8ff9-e818947d61cd_bef59b01-9aff-4aae-a612-a8532800e359.jpg?v=1707267323)
